An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Red Hill

Tank Upgrade Alternatives at Red Hill

The Administrative Order on Consent (AOC) requires the Navy to research and evaluate structural upgrades to the existing tanks at Red Hill. Currently the tanks are constructed of concrete with quarter inch steel plates forming a liner around the barrel and top of the tanks, and half inch steel plates lining the bottom of the tanks. The concrete varies from 2 ½ to 4 feet thick, and the entire tank sits atop a twenty foot thick concrete foundation.

The Navy developed a preliminary study and evaluation of 14 tank upgrade alternatives. Nine of the 14 alternatives were double-wall containment systems and the remaining five were single-wall containment systems. After further consideration of the 14 alternatives, six options were selected for in-depth study as part of the AOC. The six final options consist of three single-wall alternatives and three double-wall alternatives.

The tank upgrade study examined the unique inspection, maintenance and repair procedures that may be needed with each potential tank upgrade alternative.

On September 8, 2016 the Navy and Defense Logistics Agency (DLA) submitted the Draft Tank Upgrade Alternatives (TUA) Scope of Work, which was conditionally approved by the Regulatory Agencies on December 8, 2016 (letter available for viewing below). As required by the conditional approval, the Navy and DLA provided the Regulatory Agencies and external subject matter experts with two interim TUA Report Progress Updates in June 2017 and October 2017. The Navy and DLA have also developed and submitted the TUA Decision Process document, which describes the decision-making process and identifies the information sources the Navy and the DLA will use to select the Best Available Practicable Technology (BAPT) for a Tank Upgrade Alternative in accordance with Section 3 of the Administrative Order on Consent Statement of Work (AOC/SOW). This Decision Process Document was submitted to the Regulatory Agencies on September 29, 2017 and is available for viewing below.

On December 9, 2017, the Navy submitted the TUA Report to the Regulatory Agencies. The Report summarizes dozens of technologies that were considered to improve the storage tanks and provides detailed conceptual design information for the six upgrade options still being considered. A redacted version of the report is available for viewing below. Due to Federal contracting regulations, some information, such as the cost of the upgrade options, cannot be publicly released. This report does not recommend a specific tank upgrade alternative. EPA, the Hawaii Department of Health, the Navy, and DLA will use the study’s information, along with community input and other work produced under the agreement, in selecting the final upgrade alternative later in 2018.


If you experience a problem reading a document with assistive technology, please contact us.
You may need a PDF reader to view files on this page. See EPA’s About PDF page to learn more.